Improve message sent to Discord for missed reminder

.env.example

@@ -15,6 +15,15 @@ TIMEZONE=
 # On Linux you will need to use double slashes before the path to get the absolute path.
 # SQLITE_LOCATION=//home/lovinator/foo.db
 
+# Additional directory to store data in.
+# Note: You will still need to set the SQLITE_LOCATION to a valid path.
+# This is used to store markdown files with the reminder data.
+# The directory will be created if it does not exist.
+# Example: DATA_DIR=C:/Code/discord-reminder-bot/data
+# Example: DATA_DIR=/home/lovinator/data
+# Example: DATA_DIR=./data
+DATA_DIR=./data
+
 # Log level, CRITICAL, ERROR, WARNING, INFO, DEBUG.
 LOG_LEVEL=INFO